Method and system for determining a position of a rotor of an electric motor with noise reduction

摘要

A data storage device stores previous position readings of the rotor for a previous cycle of a pulse width modulation signal applied to the motor. A current raw position reading for the current cycle is received. A predicted position reading for a current cycle is determined based on at least one of the stored previous position readings of the previous cycle. A data processor determines whether a difference between the current raw position reading and the predicted position reading for a first mode and a second mode is within one or more preset thresholds. The data processor selects the current raw position reading as a verified reliable final position reading if a first difference for the first mode is equal to or less than a primary preset threshold or if a second difference for the second mode is equal to or less than a secondary preset threshold.

主权项

1. A method of determining a position of a rotor in a motor, the method comprising:
storing a plurality of previous position readings of the rotor for a previous cycle of a pulse width modulation signal applied to the motor, the previous position readings comprising a previous cycle final selected position and a previous cycle raw position; receiving a current raw position reading for the current cycle; determining a predicted position reading for a current cycle based on at least one of the plurality of stored previous position readings of the previous cycle, the predicted position reading comprising the previous cycle final selected position for a first mode and the previous cycle raw position for a second mode; determining whether a first difference between the current raw position reading and the predicted position reading for the first mode is within a primary preset threshold; determining whether a second difference between the current raw position reading and the predicted position reading for the second mode is within a secondary preset threshold; and selecting the current raw position reading as a verified reliable final position reading of the current cycle if the first difference for the first mode is equal to or less than the primary preset threshold or if the second difference for the second mode is equal to or less than the secondary preset threshold.